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orangesvetElectronics - Devices

Nov 8, 2013 (3 years and 1 month ago)

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Lecture 01
-
02

Introduction to computers , Components
of a computer, Classification of
computers and Personal Computers

Computer Applications to Business

1

Introduction to computer

2

Introduction to computer


Computer is an electronic device.


It is capable of receiving input,


processing the data on the basis of set of
given instructions,


producing the output and


capable of storing the information (if
required).


3

Components of a Computer


Input Devices



Output Devices



Storage Devices



System Unit

4

Input Devices

5

Input Devices


Keyboard



Mouse



Trackball



TrackPad



Microphone




6

Input Devices


Barcode Reader



Web cam



Digital Camera



Joy Stick



Game Controller


7

Output Devices

8

Output Devices


Monitor



Printer



Speakers



Headphones


9

Storage Devices

10

Storage Devices


Hard Drive



Floppy Drive



CD, DVD, BRD Drives



USB



RAM

11

System Unit

12

Motherboard

13

Motherboard

14

Classification of computers

15



Supercomputer




Mainframe




Minicomputer




Microcomputer

Classification of computers on the
basis of shape and size

16

Supercomputer


Super Computer are the largest, fastest and
most expensive special purpose computer in
the world.



They are designed to process scientific jobs
like either to do scientific research or other
especial purposes.



for example; CRAY

17


Mainframe



Mainframe Computer are larger than Mini
computer but it is smaller than Super computer.


Mainframe computers are also multi
-
user system
therefore more than 100 users can work at the
same time with one Mainframe computer.


They are used in the hotels, industries, banks,
airlines, etc.


for example; IBM 240.

18

Minicomputer


The Mini computer is medium in size i.e. it is also
general purpose computer but unlike Micro
computer.



It serves the multiple users i.e. many users can
work at the same time with the single mini
computers to performs data processing,
programming, designing and other jobs.



They are used in Government Offices, University,
Banks, Industries, Hotels etc.



for example; HP 3000.

19

Microcomputer


The Micro computer is the smallest computer
system.


The size of computer ranges from the size of
calculator to the size of desktop computer.


It is commonly used in offices, homes, schools
etc.


Micro computer are also referred to as personal
computer (PC), Desktop computer, Home
computer or Laptops etc.



for example; IBM PC, IBM AT(Advanced
Technology).

20

Classification of computers on the
basis of purpose /use



1)
General Purpose computers


2)
Special purpose computers

21

Classification of computers on the
basis of purpose /use

1)
General Purpose computers


These computers are designed to perform wide variety
of tasks (They are not limited)


For example: The computers at your home, which can
be used to:


Create and print documents


Play music and video


Play video games


Check emails


Browse the internet


And many more..


22

Classification of computers on the
basis of purpose /use

2)
Special Purpose computers


These computers are designed to perform
some specific task or set of tasks (They are
limited).


For example:


The computers at airline can only process
and store the data regarding flights.


The computers at weather forecasting can
only predict the weather nothing else.


23

Personal computer (PC)



The computers which are designed to be used
by a
single person
at a time are known as
Personal Computers (PCs
).



PCs are also called
microcomputers
.

24

Personal computer (PC)


There are six primary type of computers which lie
under this category:


1)
Desktop
computers

2)
Workstations

3)
Notebook
computers

4)
Tablet
computers

5)
Handheld
computers

6)
Smart
phones


25

Desktop computers

26

Desktop computers


The
most common
type of personal computer
is the desktop
computer.


A PC that is
designed to
sit on (or under) a
desk or
table
.


These are the systems you
see all around
you,
in
schools, homes, and offices.


Today's desktop computers are far more
powerful than those of just a
few years ago.

27

Desktop computers


Not
only do these
machines enable
people to do
their jobs with greater ease
and efficiency,
but
they
can be
used
:


to
communicate,


produce
music,


edit photographs
and videos
,



play sophisticated
games,
and


much more.



Used by everyone from preschoolers
to nuclear
physicists.

28

Desktop computers


The main
component of
a desktop PC is the
system
unit
.


There
are two
common designs
for desktop
computers.

1)
Horizontally oriented
system unit, which
usually
lies flat on the
top of
the user’s desk. Many
users
place their
monitor on top of the system
unit.

2)
Vertically
oriented
tower
models have
become
the more popular
style of
desktop
system.

29

Workstations

30

Workstations


A workstation is a specialized,
single
-
user
computer
that typically has more
power and
features than a standard desktop
PC.


These machines are
popular among
scientists,
engineers,
and animators
who need a system
with greater
-
than
-
average
speed
and the
power to perform
sophisticated tasks
.

31

Workstations


Workstations often have large
, high
-
resolution
monitors and accelerated
graphics handling
capabilities
, making them suitable
for:


advanced architectural or
engineering
design,


modeling,



animation, and


video
editing.

32

Notebook Computers

33

Notebook Computers


Notebook computers, as
their name
implies,
approximate
the shape
of an
8.5
-
by
-
11
-
inch
notebook
and easily fit inside
a briefcase.


Because people
frequently set
these devices
on their
lap, they are also
called
laptop
computers
.


Notebook computers
can operate
on
alternating
current or special
batteries
.

34

Notebook Computers


These amazing devices
generally weight
less than
eight pounds,
and some
even
weight
less than
three
pounds.


During
use, the
computer’s
lid is raised
to reveal
a
thin monitor and a keyboard
.


When not in use, the device folds up for
easy
storage.


Notebooks
are
fully functional microcomputers;
the people who use
them need
the power of a
full
-
size desktop computer wherever they
go.

35

Notebook Computers


Because of their portability, notebook PCs fall
into a category of
devices called
mobile
computers

systems small enough
to be
carried by their user
.


Some notebook systems are designed
to be
plugged into a
docking station
,
which may
include a large monitor, a
full
-
size keyboard
and mouse, or other devices

36

Tablet PCs

37

Tablet PCs


The tablet PC is the newest
development in
portable, full
-
featured
computers.


Tablet
PCs offer
all the functionality
of a
notebook PC, but
they are
lighter and can
accept input from
a special
pen

called a
stylus

or a
digital pen

that is used to
write
directly on
the screen.

38

Tablet PCs


Many tablet PCs also have a built
-
in
microphone and special
software
that accepts
input from the user's
voice.


A few models even have a
fold
-
out keyboard
,
so they can be transformed into a
standard
notebook PC.


Some models also can be connected to
a
keyboard
and a full
-
size monitor.

39

Handheld PCs

40

Handheld PCs


Handheld personal computers are
computing devices
small enough to fit in
your hand.


A popular
type of
handheld computer is the
personal
digital
assistant (PDA
)
.


A PDA is
no larger
than a small appointment
book and
is normally used for special
applications
, such as


taking
notes,


displaying
telephone numbers and addresses,
and


keeping
track of dates or agendas.


Many
PDAs can be connected to larger
computers to
exchange data.


41

Handheld PCs


Many PDAs let the user access the
Internet

through a wireless
connection.


And several
models offer
features such
as


Cameras


music
players, and


Global Positioning Systems (GPS).

42

Smart Phones

43

Smart Phones


Smart phones can be considered as
computers.


They are different than mobile phones.


Because these
phones offer
advanced features
not typically
found in
cellular phones
, they are
sometimes called as
smart phones
.

44

Smart Phones


These features can
include Web
and
e
-
mail
access, special software such
as personal
organizers, or special
hardware such
as digital
cameras or music players
.



Some models even break in half to reveal
a
miniature
keyboard
.

45